test(webapp): drop CI-unsafe getWorkerQueue integration test

It imported queues.server.ts, which transitively starts DB/Redis-touching
singletons; in the no-infra unit shard those reject as unhandled rejections
and fail the run (passed locally only because docker services were up). The
guard logic is covered by prismaErrors.test.ts; the full HTTP path belongs in
a toxiproxy e2e, not the unit shard.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: d-cs